Ground surfaces that are impenetrable to water can reason significant environmental problems, including flooding and also contaminated runoff. Due to the fact that impervious surencounters are such a hazard, many type of governments, prefer the City of Louisville, Kentucky, charge landowners via high quantities of impervious surdeals with on their properties. To calculate fees, you"ll segment and classify aerial imagery by land also use to calculate the area of impervious surencounters per land also parcel.

You are watching: What fraction do the blue segments make up?

This lesson was last tested on November 5, 2021, making use of Pro 2.8. If you"re making use of a different version of Pro, you may enrespond to various functionality and also results.

Leskid Plan

Segment the imageryGroup pixels into segments to make classification even more specific.

30 minutes
Classify the imagery

Perdevelop a managed classification based on land also usage.

30 minutes
Calculate impervious surchallenge area

Assess classification accuracy and also determine surconfront area per parcel.

15 minutes

Segment the imagery

To recognize which components of the ground are pervious and impervious, you will certainly classify the imagery right into land-use types. Impervious surencounters are generally human-made: buildings, roadways, parking lots, brick, or asphalt. Pervious surdeals with include vegetation, water bodies, and also bare soil. Using multispectral imagery for this kind of classification works well bereason each land-use kind has a tendency to have actually unique spectral attributes, additionally called spectral signature.

However before, if you try to classify a picture inwhich practically eextremely pixel has a unique combination of spectralfeatures, you are most likely to encounter errors andinaccuracies. Instead, you"ll team pixels right into segments,which will generalize the photo and also considerably reduce the numberof spectral signatures to classify. Once you segment the imagery, you will performa managed classification of the segments. You will firstclassify the photo into broad land-use kinds, such as roofs orvegetation. Then, you will reclassify those land-use kinds intoeither impervious or pervious surencounters.

Before you classify the imagery, you will adjust the band also combicountry to differentiate features clearly.

Download and also open up the project

To obtain began, you"ll downfill data provided by the neighborhood government of Louisville, Kentucky. This data consists of imagery of the research area and also land parcel functions.


Depending on your internet browser, you might have been motivated to pick the file"s place prior to you began the downfill. Many browsers downpack to your computer"s Downloads folder by default.

Right-click the file and also extract it to a area you can quickly uncover, such as your Documents folder. Open the Surface_Imperviousness folder.


The folder contains numerous subfolders, an Pro job file (.aprx), and an toolbox (.tbx). Before you check out the other information, you will open up the job file.

Extract spectral bands

The multiband also imagery of the Louisville neighborhood presently uses the natural color band combination to display screen the imagery the method the humale eye would certainly check out it. You will certainly change the band also combination to better distinguish urban functions such as concrete from organic features such as vegetation. While you deserve to adjust the band also combination by right-clicking the bands in the Components pane, later parts of the workcirculation will require you to use imagery with only three bands. So you"ll produce a picture by extracting the three bands that you desire to present from the original photo.

In the Components pane, click the Louisville_Neighborhood.tif layer to choose it. On the ribbon, click the Imagery tab. In the Analysis team, click Raster Functions.


The Raster Functions pane shows up.

Raster attributes apply an procedure to a raster image on the fly, definition that the original data is unadjusted and no new datacollection is developed. The output takes the create of a layer that exists only in the job in which the raster function was run. You will usage the Extract Bands feature to produce a picture with only three bands to differentiate in between impervious and pervious surfaces.


The Extract Bands function shows up.

The bands you extract will certainly include Near Infrared (Band4), which emphasizes vegetation; Red (Band also 1), which emphasizeshuartificial objects and also vegetation; and also Blue (Band also 3), which emphasizes water bodies.

In the Parameters tab, for Raster, choose the Louisville_Neighborhood.tif image. Confirm that Method is set to Band also IDs.


The Method parameter determines the type of keyword provided to describe bands once you enter the band also combicountry. For this data, Band also IDs (a single number for each band) are the simplest means to describe each band.

For Combination, delete the existing message and also kind 4 1 3 (via spaces). Confirm that Missing Band Action is collection to Best Match.


The Missing Band Action parameter specifies what action occurs if a band detailed for extractivity is unaccessible in the picture. Best Match chooses the best accessible band also to usage.


The brand-new layer, named Louisville Neighborhood Extracted Bands_Louisville_Neighborhood.tif, is included to the map. It display screens just the extracted bands.

In the Components pane, right-click Louisville Neighborhood Extracted Bands_Louisville_Neighborhood.tif, click Properties, and for Name, type Louisville Neighborhood Extracted Bands, and click OK.

The yellow Parcels layer covers the imagery and deserve to make some attributes hard to check out. You will not usage the Parcels layer until later in the project, so you will certainly revolve it off for now.


The Louisville Neighborhood Extracted Bands layer mirrors the imagery with the band combicountry that you made a decision (4 1 3). Vegetation shows up as red, roadways show up as gray, and roofs appear as shades of gray or blue. By emphasizing the distinction between organic and also hufabricated surdeals with, you have the right to even more quickly classify them later on.


Although the Louisville Neighborhood Extracted Bands layer shows up in the Materials pane, it has not been added as information to any of your folders. If you rerelocate the layer from the map, you will certainly delete the layer permanently.

Configure the Classification Wizard

Next, you will certainly open the Group Wizard and also configure its default parameters. The Category Wizard walks you via the steps for image segmentation and also classification.

In the Components pane, make certain that the Louisville Neighborhood Extracted Bands layer is selected. On the ribbon, on the Imagery tab, in the Image Category team, click the Category Wizard button.



If you desire to open up the individual devices available in the wizard, you can accessibility them from the exact same tab. In the Image Group group, click Group Tools and also select the tool you want.

The Image Classification Wizard pane appears.

The wizard"s initially web page (suggested by the blue circle at the peak of the wizard) consists of a number of basic parameters that identify the type of classification to perdevelop. These parameters impact which succeeding measures will certainly appear in the wizard. You will use the looked after classification strategy. This method is based on user-characterized training samples, which suggest what forms of pixels or segments need to be classified in what method. (An unoversaw classification, by comparison, relies on the software to decide classifications based on algorithms.)

Confirm that Classification Method is collection to Supervised and that Category Type is set to Object based.


The object based classification kind provides a procedure referred to as segmentation to group bordering pixels based upon the similarity of their spectral features.

Next, you will certainly choose the Classification Schema. The Group Schema is a paper that mentions the classes that will certainly be supplied in the classification. A schema is conserved in an Esri classification schema (.ecs) file, which offers JSON syntaxation. For this workcirculation, you"ll modify the default schema, NLCD2011. This schema is based upon land cover forms supplied by the USA Geological Survey.


The next parameter determines the Output Location worth, which is the workarea that stores all the outputs created in the wizard. These outputs include training data, segmented imperiods, practice schemas, accuracy assessment information, intermediate outputs, and resulting classification results.

Under Optional, you will not enter anything for Segmented Image, Training Samples, or Reference Datacollection bereason you don"t have actually any kind of of these elements produced ahead of time.

Segment the image

You"ll now select the parameters for Segmentation. The Segmentation procedure teams surrounding pixels with comparable spectral qualities into segments. Doing so will generalize the image and make it simpler to classify. Instead of classifying hundreds of pixels via distinct spectral signatures, you will classify a much smaller sized number of segments. The optimal variety of segments and the variety of pixels grouped right into a segment adjust depending upon the photo dimension and the intended usage of the picture.

Below is an example of what segmentation looks favor. Compare the nonsegmented photo (left) with the segmented photo (right). For circumstances, the roof of each home is generalized as a solitary segment.


The initially parameter is Spectral detail. It sets the level of prominence given to spectral differences between pixels on a range of 1 to 20. A higher value suggests that pixels have to be more similar to be grouped together, producing a greater number of segments. A lower value creates fewer segments. Because you desire to distinguish in between pervious and also impervious surdeals with (which mostly have extremely various spectral signatures), you will use a reduced worth.

The following parameter is Spatial information. It sets the level of prestige given to the proximity between pixels on a range of 1 to 20. A greater worth implies that pixels have to be closer to each other to be grouped together, developing a greater number of segments. A lower value creates fewer segments that are even more uniform throughout the image. You will certainly use a low value bereason not all comparable functions in your imagery are clustered together. For instance, dwellings and roadways are not constantly close together and are situated throughout the complete image degree.

The next parameter is Minimumsegment dimension in pixels. Unlike the various other parameters, thisparameter is not on a range of 1 to 20. Segments with fewer pixels than the valuestated in this parameter will certainly be combined right into a neighboringsegment. You execute not desire segments that are too little, yet you alsoperform not desire to merge pervious and also impervious segments into onesegment. The default value will certainly be acceptable in thiscase.

The last parameter, Show Segment Boundaries Only, determines whether the segments are displayed via black boundary lines. This is helpful for differentiating nearby segments via equivalent colors however might make smaller segments more challenging to view. A few of the functions in the photo, such as the homes or drivemethods, are reasonably little, so you will leave this parameter unchecked.


A pevaluation of the segmentation is added to the map. It is also included to the Components pane via the name Preview_Segmented.


At first sight, the output layer does not appear to have actually been segmented the way you wanted. Features such as vegetation seem to have actually been grouped right into many kind of segments that blur together, specifically on the left side of the picture. Tiny segments that seem to include only a handful of pixels dot the location too. However before, this picture is being produced on the fly, which indicates the processing will certainly readjust based upon the map extent. At complete degree, the picture is generalized to conserve time. You will certainly zoom in to reduce the generalization, so you have the right to better watch what the segmentation looks choose through the parameters you determined.


The pevaluation segmentation runs aacquire. With a smaller map level, the segmentation even more accurately mirrors the parameters you offered, with fewer segments and smovarious other outputs.


If you are unhappy with how the segmentation turned out, you can go back to the previous web page of the wizard and change the parameters. The segmentation is only preperceived on the fly bereason it can take a lengthy time to process the actual segmentation, so it is good exercise to test various combicountries of parameters until you discover a result you prefer.

In the Contents pane, right-click Preview_Segmented and pick Zoom To Layer to return to the complete level.




Saving the job does not save your area in the wizard. If you close the project before you complete the whole wizard, you will lose your spot and also have to begin the wizard over from the beginning.

You have extracted spectral bands to emphasize the distinction in between pervious and also impervious functions. You additionally erected the segmentation parameters to group pixels with comparable spectral features right into segments and simplify the image. Next, you will certainly classify the imagery by perviousness or imperviousness.

Classify the imagery

In this area, you"ll set up the classification of the photo. A supervised classification is based upon user-identified training samples, which suggest what forms of pixels or segments need to be classified in what method. (An unoversaw classification, by contrast, depends on the software program to decide classifications based on algorithms.) You"ll initially classify the photo into broad land-usage forms, such as vegetation or roads. Then, you will certainly reclassify those land-usage forms into either pervious or impervious surdeals with.

Create training samples

To perform a managed classification, you require training samples. Training samples are polygons that recurrent distinctive sample locations of the various land-cover kinds in the imagery. The training samples increate the classification tool around the variety of spectral qualities that each land also cover have the right to exhilittle bit.

First, you"ll modify the default schema to contain 2 parent classes: Impervious and also Pervious. Then, you will certainly add subclasses to each course that recurrent forms of land cover. If you attempted to classify the segmented photo into only pervious and impervious surdeals with, the classification would certainly be too generalised and most likely have actually many kind of errors. By classifying the photo based on more certain land-usage forms, you will certainly create a much more exact classification. Later, you will certainly reclassify these subclasses into their parent classes.

In the Image Classification Wizard pane, right-click each of the default classes and also click Remove Class. For each course, click Yes in the Remove Class home window.
In the Add New Class home window, for Name, form Impervious. For Value, kind 20, and for Color, choose Gray 30%. Click OK.

To check out the name of a color, point to the shade in the color palette selector and the shade name will show up.


The worth 20 is the number that will certainly be attributed to all segments figured out as impervious via the classification process. It is more of a numeric label and is not intended to be offered in any kind of calculations.

Right-click NLCD2011 aacquire and choose Add New Class. Add a class called Pervious with a worth of 40 and a color of Quetzal Eco-friendly. Click OK.
Right-click the Impervious parent class and select Add New Class. Add a course called Gray Roofs via a value of 21 and also a color of Gray 50%. Click OK.

In this leskid, you will not produce other roof kinds. However, in a job with more diverse structures stood for in the imagery, you could think about creating a red roof land-usage type, because their spectral attributes are various from gray roofs.

Next, you"ll produce a training sample on the map using this class.

Click the Gray Roofs course to select it. Then, click the Polygon switch.
Zoom to the cul-de-sac to the northwest of the community.

You deserve to permit navigation devices while the Polygon tool is active by holding down the C essential.

On the northernmost roof in the cul-de-sac, draw a polygon. Double-click to complete the drawing. Make sure the polygon covers only pixels that make up the roof.

The polygon does not have to cover the entire roof. It just demands to be a sample of the roof, yet the majority of importantly, it need to only encompass roof product.

A row is included to the wizard for your new training sample.


When developing training samples, you want to cover a high variety of pixels for each land-usage kind. For this leskid, having about six samples for each land-use type will be enough, however for a real job, wright here the imagery covers a a lot larger extent, you could require substantially more samples.

You"ll produce even more training samples to recurrent the roofs of the homes.


Eincredibly training sample that you make is added to the wizard. Although you have actually just drawn training samples on roofs, each training sample presently exists as its own class. You"ll eventually want all gray roofs to be classified as the same value, so you will certainly merge the training samples that you produced into one class.

In the wizard, click the initially row to choose it. Press Change and also click the last row to pick all the training samples.Above the list of training samples, click the Collapse button.


The training samples collapse into one class. You deserve to proceed to add more training samples for gray roofs and also merge them right into the Gray Roofs class. The optimum strategy is to gather samples throughout the whole image.

Next, you"ll add more land-usage types.

Right-click Impervious and also choose Add New Class to create 2 even more impervious subclasses based on the complying with table (the colors don"t need to be a perfectmatch):
Right-click Pervious and also pick Add New Class to create 4 pervious subclasses based on the complying with table:
Subcourse Value Color

Bare Earth


Medium Yellow



Medium Apple



Leaf Green



Cretan Blue



Sahara Sand


These eight classes are particular to the land-use types for this photo. Images of different places might have actually different types of land-usage or ground attributes that must be represented in a classification.

Shadows are not actual surdeals with and cannot be either pervious or impervious. However, shadows are usually cast by tall objects such as dwellings or trees and also are more most likely to cover grass or bare earth, which are pervious surfaces.

Draw about 6 training samples for each land-use type throughout the whole image. Zoom and also pan throughout the image as essential.

You can likewise revolve off and on the Preview_Segmented layer to check out the Louisville Neighborhood Extracted Bands layer to make better sense of the landscape.

When you are satisfied through your training samples, at the optimal of the Training Samples Manager pane, click the Save switch.

Classify the image

Now that you have actually produced the training samples, you will choose the classification approach. Each classification method offers a various statistical procedure involving your training samples. You will certainly use the Support Vector Machine classifier, which can handle bigger imperiods and also is less at risk to inequalities in your training samples. Then, you"ll train the classifier through your training samples and develop a classifier definition file. This file will certainly be supplied in the time of the classification. Once you produce the file, you will certainly classify the image. Lastly, you will reclassify the pervious and also impervious subclasses right into their parent classes, developing a raster via only two classes.

In the Image Group Wizard pane, in the Train web page of the wizard, confirm that Classifier is collection to Support Vector Machine.

For the following parameter, you deserve to specify the maximum variety of samples to use for defining each class. You desire to use all your training samples, so you will certainly change the maximum variety of samples per class to 0. Changing the maximum to 0 is a trick to ensure all training samples are provided.

For Maximum Number of Samples per Class, type 0.


Next, you"ll train the classifier and also display a ptestimonial.

Click Run.

The procedure might take a lengthy time, as multiple procedures are run. First, the image is segmented (previously, you just segmented the photo on the fly, which is not permanent). Then, the classifier is trained and the classification perdeveloped. When the procedure finishes, a preview of the classification is shown on the map.


Depfinishing on your training samples, your classification ptestimonial must show up to be reasonably exact (the colors in the datacollection correspond to the colors you made a decision for each training sample class). However, you may alert that some functions were classified mistakenly. For instance, in the example picture, the muddy pond southern of the neighborhood was incorrectly classified as a gray roof, once it is actually water. Classification is not an exact scientific research and also hardly ever will eincredibly attribute be classified perfectly. If you check out just a couple of inaccuracies, you deserve to correct them manually later in the wizard. If you watch a huge variety of inaccuracies, you may have to develop even more training samples. Also, in this instance, roadways and drivemeans are both impervious, so it won"t adjust the last classification right into pervious and also impervious land cover.

The following web page is the Classify web page. You will certainly usage this page to run the actual classification and save it in your geodatabase.

For Output Classified Datacollection, change the output name to Classified_Louisville.tif. Leave the staying parameters unchanged and click Run.

The process runs and the classified raster layer Classified_Louisville is included to the map. It looks equivalent to the preview.

The following page is the Merge Classes page. You will use this web page to merge subclasses right into their parent classes. Your raster currently has actually seven classes, each representing a type of land also use. While these classes were vital for an accurate classification, you are only interested in whether each class is pervious or impervious. You will certainly merge the subclasses into the Pervious and Impervious parent classes to create a raster with only 2 classes.


When you adjust the first class, a ptestimonial is added to the map. The ptestimonial mirrors what the reclassified picture will look choose. When you readjust all of the classes, the ptestimonial have to only have actually 2 classes, representing pervious and also impervious surencounters.

Reclassify errors

The last page of the wizard is the Reclassifier web page. This page includes tools for reclassifying little errors in the raster datacollection. You will certainly usage this page to resolve an incorrect classification in your raster.

In the Components pane, unexamine all layers other than the Preview_Recourse and also Louisville_Neighborhood.tif layers. Click the Preview_Recourse layer to pick it.On the ribbon, click the Appearance tab. In the Compare team, click Swipe.
Drag the reminder throughout the map to visually compare the ptestimonial to the original neighborhood imagery.


One inaccuracy that is current in the instance image is that some bare earth patches southern of the area were misclassified as pervious. These patches are not connected to any various other impervious objects, so you deserve to reclassify them via loved one ease.

Zoom to the patches of bare earth area.
In the wizard, click Reclassify within a region.


With this tool, you can attract a polygon on the map and reclassify everything within the polygon.

In the Remap Classes section, confirm that Current Class is set to Any. For New Class, pick Pervious.


With these settings, any pixels in the polygon will be reclassified to pervious surencounters. Next off, you"ll reclassify the bare earth patches.

Draw a polygon about the bare earth patches. Make sure you perform not incorporate any various other impervious surdeals with in the polygon.

If you make a mistake, you have the right to uncarry out the reclassification by unchecking it in the Edits Log pane.

While you likely noticed other inaccuracies in your classification, for the purposes of this leskid, you will certainly not make any even more edits.

Zoom to the full level of the data. In the Image Category Wizard, for Final Classified Dataset, kind Louisville_Impervious.tif (including the .tif extension). Click Run. When the tool completes, click Finish.

You have classified imagery of a community in Louisville to recognize land cover that was pervious and land also cover that was impervious. Next, you"ll calculate the area of impervious surencounters per land parcel so the local federal government can asauthorize storm water fees.

Calculate impervious surchallenge location

Using the results of the classification, you will calculate the area of impervious surface per parcel and also symbolize the parcels accordingly.

Tabulate the area

To determine the location of impervious and also pervious surfaces within each parcel of land in the community, you will first calculate the area and store the outcomes in a stand-alone table. Then, you will certainly join the table to the Parcels layer.

On the ribbon, on the Analysis tab, in the Geohandling group, click Tools.


The Geohandling pane appears.

In the Geoprocessing pane, search for the Tabulate Area tool and also open it.


This tool calculates the location of some classes (in this lesboy, pervious and also impervious) within stated zones (in this lesson, each parcel).

For Input raster or feature zone information, choose the Parcels layer. Confirm that the Zone field parameter populates with the Parcel ID area.


The zone field have to be an attribute that identifies each zone uniquely. The Parcel ID area has actually a unique identification number for each feature, so you will certainly leave the parameter unchanged.

For Input raster or function course data, choose the Louisville_Impervious layer. For Class area, pick Class_name.


The class area determines the field whereby location will be figured out. You desire to know the area of each class in your reclassified raster (pervious and impervious), so the Class_name area is appropriate.

For Output table, click the message field, confirm that the output place is the Neighborhood_File geodatabase, and also adjust the output name to Impervious_Area.


The final parameter, Processing cell dimension, determines the cell size for the area calculation. By default, the cell dimension is the same as the input raster layer Louisville_Impervious, which is half a foot (in this case). You"ll leave this parameter unreadjusted.

The tool runs and also the table is included to the Contents pane, in the Standalone Tables area. You"ll take a look at the table that you produced.

In the Materials pane, under Standalone Tables, right-click the Impervious_Area table and click Open.


The table has a typical ObjectID area, and 3 various other fields. The initially is the Parcel_ID field from the Parcels layer, mirroring the unique identification number for each parcel. The next 2 are the class areas from the Louisville_Impervious raster layer. The Impervious area mirrors the location (in feet) of impervious surencounters per parcel, while the Pervious area reflects the location of pervious surdeals with.

You currently have actually the location of impervious surfaces per parcel, yet only in a stand-alone table. Next, you"ll join the stand-alone table to the Parcels layer so that the area information becomes easily accessible in the layer. You"ll percreate the sign up with based on the Parcel ID field, which is prevalent to the Parcel layer and also the stand-alone table.

Right-click the Parcels layer, point to Join and Relates, and also then choose Add Join.

The Add Join home window appears.

In the Add Join home window, enter the following:
For Input Table, confirm that Parcels is schosen. For Input Join Field, pick Parcel ID. For Join Table, select the Impervious_Area table. For Join Table Field, select Parcel_ID.



You deserve to disregard the warning showing up next to Input Join Field. The number of features in the Parcels layer is not exceptionally huge, so it is not an worry that the Parcel ID area not indexed.

Accept the default worths for the other parameters and also click OK. In the Components pane, right-click the Parcels layer and pick Attribute Table. In the attribute table, confirm that the attribute table currently includes the adhering to fields:

Clean up the Parcels attribute table

Now that the tables have been joined, you will certainly change the area aliases to be even more informative.


The Fields check out for the Parcels attribute table shows up.

With the Fields see, you have the right to include or delete fields, as well as rename them, adjust their aliases, or adjust other settings. You"ll adjust the field aliases of the 2 area areas to be even more informative.

In the Alias column, readjust the alias of the IMPERVIOUS field to Impervious Area (Feet). Change the alias of the PERVIOUS field to Pervious Area (Feet).
On the ribbon, on the Fields tab, in the Changes group, click Save.


The alters to the attribute table are conserved.

Close the Fields see and also close the attribute table.

Next off, you"ll represent the parcels by impervious surconfront location on the map.

Symbolize the Parcels layer

Now that you have impervious location values assigned to each parcel, you will signify the parcels to visually compare the parcels by impervious location.

In the Materials pane, ensure the Parcels and Louisville_Neighborhood.tif imagery layers are turned on and all other layers are turned off.
Click the Parcels layer to select it.On the ribbon, on the Appearance tab, in the Drawing team, pick Symbology.


The Symbology pane for the Parcels layer shows up. Right now, the layer is symbolized through a solitary symbol, as a yellow outline. You will certainly symbolize the layer so that parcels through high areas of impervious surfaces appear in different ways than those via low areas.


A series of parameters becomes accessible. First, you will certainly change the field that determines the symbology.

The symbology on the layer transforms immediately. However before, there is little bit array between the symbology of the parcels because of the low number of classes.


The layer symbology alters aget.


The parcels via the highest area of impervious surencounters show up to be the ones that correspond to the location of roads. These parcels are exceptionally huge and also almost completely impervious. In general, larger parcels tfinish to have actually larger impervious surdeals with. But there could additionally be great variations between smaller parcels, based on the dimension of the buildings or the alternative by the owners to relocation an impervious drivemethod or terrace through pervious ones or possibly install a green roof on their residence.

While you can represent the layer by the percentage of area that is impervious, the majority of storm water fees are based on full area, not percentage of area.

In this leschild, you classified an aerial picture of a community in Louisville, Kentucky, to show locations that were pervious and impervious to water. You then assessed the accuracy of your classification and also determined the location of impervious surencounters per land also parcel. With the indevelopment that you obtained in this leschild, the local federal government would certainly be better equipped to identify storm water bills.

You can use this workflow via your own data. As lengthy as you have actually high-resolution, multispectral imagery of an area, you have the right to classify its surfaces.


To go better, consider doing the lesson Assess the accuracy of a perviousness classification. Building on the outcomes you simply derived, you"ll exactly how to formally assess the accuracy of your classification. This is a critical action to prove the reliability of your outcomes.

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